Working principle of APC online UPS power supply

The operation mode of APC online UPS (0n Line UPS) is that “the mains power and the electrical equipment are isolated, and the mains power will not directly supply power to the electrical equipment”. Instead, it is converted into DC power at the UPS, and then divided into two paths. One path charges the battery, and the other path returns to AC power to supply power to the electrical equipment. When the quality of the mains power supply is unstable or there is a power outage, the battery switches from charging to power supply until the mains power returns to normal before returning to charging. “UPS is fully involved in the entire process of power consumption”. Its advantage is that the output waveform is a sine wave like the mains power, and it is pure and noise free, not affected by the instability of the mains power. It can supply power to “inductive loads” such as electric fans. As long as the UPS output power is sufficient, it can supply power to any device using mains power.